diff --git a/Include/abstract.h b/Include/abstract.h
index dc21692..a496817 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -793,6 +793,19 @@
      PyAPI_FUNC(Py_ssize_t) PyNumber_AsSsize_t(PyObject *o, PyObject *exc);
 
        /*
+         Returns the Integral instance converted to an int. The
+         instance is expected to be int or long or have an __int__
+         method. Steals integral's reference. error_format will be
+         used to create the TypeError if integral isn't actually an
+         Integral instance. error_format should be a format string
+         that can accept a char* naming integral's type.
+       */
+
+     PyAPI_FUNC(PyObject *) _PyNumber_ConvertIntegralToInt(
+             PyObject *integral,
+             const char* error_format);
+
+       /*
         Returns the object converted to Py_ssize_t by going through
         PyNumber_Index first.  If an overflow error occurs while
         converting the int-or-long to Py_ssize_t, then the second argument